已知(a+b)²=16,(a-b)²=4,求代数式a²+b²和ab的值 最主要要求内个过程.最好是列出方程。内种可以往里套的。例如(a+b)²-2ab=a²+b²这种。
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![已知(a+b)²=16,(a-b)²=4,求代数式a²+b²和ab的值 最主要要求内个过程.最好是列出方程。内种可以往里套的。例如(a+b)²-2ab=a²+b²这种。](/uploads/image/z/4080852-36-2.jpg?t=%E5%B7%B2%E7%9F%A5%28a%2Bb%29%26%23178%3B%3D16%2C%28a-b%29%26%23178%3B%3D4%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8Fa%26%23178%3B%2Bb%26%23178%3B%E5%92%8Cab%E7%9A%84%E5%80%BC+%E6%9C%80%E4%B8%BB%E8%A6%81%E8%A6%81%E6%B1%82%E5%86%85%E4%B8%AA%E8%BF%87%E7%A8%8B.%E6%9C%80%E5%A5%BD%E6%98%AF%E5%88%97%E5%87%BA%E6%96%B9%E7%A8%8B%E3%80%82%E5%86%85%E7%A7%8D%E5%8F%AF%E4%BB%A5%E5%BE%80%E9%87%8C%E5%A5%97%E7%9A%84%E3%80%82%E4%BE%8B%E5%A6%82%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-2ab%3Da%26%23178%3B%2Bb%26%23178%3B%E8%BF%99%E7%A7%8D%E3%80%82)
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